(19)
(11) EP 0 284 152 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.06.1990 Bulletin 1990/26

(43) Date of publication A2:
28.09.1988 Bulletin 1988/39

(21) Application number: 88200506.9

(22) Date of filing: 18.03.1988
(51) International Patent Classification (IPC)4: H03C 1/02, H03G 3/20
(84) Designated Contracting States:
DE FR GB

(30) Priority: 20.03.1987 JP 63698/87

(71) Applicant: Philips Electronics N.V.
5621 BA Eindhoven (NL)

(72) Inventors:
  • Katsuhiro, Endo
    NL-5656 AA Eindhoven (NL)
  • Yasumichi, Imai
    NL-5656 AA Eindhoven (NL)

(74) Representative: De Jongh, Cornelis Dominicus et al
INTERNATIONAAL OCTROOIBUREAU B.V., Prof. Holstlaan 6
5656 AA Eindhoven
5656 AA Eindhoven (NL)


(56) References cited: : 
   
       


    (54) Amplitude modulation apparatus


    (57) An amplitude modulation apparatus characterized in that a high frequency modulation circuit (3) is provided at the down-stream side of an automatic output control circuit (2) which inputs a low frequency signal, the high frequency signal level of an output of said high fre­quency modulation circuit being detected to obtain a detection signal which activates said automatic output control circuit.





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